K2: Fix priority for implicit receiver + extensionInvoke

See K1 counterpart at org.jetbrains.kotlin.resolve.calls.tower.TowerResolver.Task.processImplicitReceiver

^KT-58943 Fixed
^KT-59541 Fixed

compiler/testData/codegen/box/defaultArguments/kt36853_fibonacci.kt

@@ -1,10 +1,5 @@
 // WITH_STDLIB
 
-// IGNORE_BACKEND_K2: JVM_IR, JS_IR, NATIVE, WASM
-// FIR status:
-//  java.lang.StackOverflowError
-//	at Nat$Companion$invoke$1.next(kt36853_fibonacci.kt:40) ...
-
 fun box(): String {
     Nat<Int>(
         nil = 0,